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Red light is used in signals because of it's highest wavelength of all the visible light. As a result it is scattered the least and can penetrate a larger distance.
Why is the whole visible spectrum (VIBGYOR) not used instead of red light?
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Answer:
it is not used instead of red light because the VIBGYOR consist to form white light and I has no frequency and cannot penetrate and so it is not used
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because the red light has much higher wavelength then the whole visible spectrum collectively
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